See hardheaded in Webster's New World Roget's A-Z Thesaurus II
adjective
Tenaciously unwilling to yield:
bullheaded, dogged, headstrong, mulish, obstinate, pertinacious, perverse, pigheaded, stiff-necked, tenacious, willful. See resistHaving or indicating an awareness of things as they really are:
down-to-earth, hard, matter-of-fact, objective, practical, pragmatic, pragmatical, prosaic, realistic, sober, tough-minded, unromantic. See excite, real
Learn more about hardheaded